Wow that's a really cool idea! I should keep track of this. I have a big roo ratio with my cochin hen. Out of 15 chicks, only 4 or 5 were girls. :/I do lots of egg swapping. I know which hens produce a better pullet to roo ratio and try to use their eggs. Something new I tried this year and it worked well. Mama has a track record of producing roo heavy broods. So this summer I swapped eggs. Ate hers and gave her other hens eggs. Out of her 15 from the summer only 5 are roo's.![]()